Stimulation of methanogenesis in bituminous coal from the upper Silesian coal basin

Pytlak, Anna; Szafranek-Nakonieczna, Anna; Sujak, Agnieszka; Grządziel, Jarosław; Polakowski, Cezary; Kuźniar, Agnieszka; Proc, Kinga; Kubaczyński, Adam; Goraj, Weronika; Gałązka, Anna; Gruszecki, Wiesław I.; Bieganowski, Andrzej; Stępniewska, Zofia

doi:10.1016/j.coal.2020.103609

Cited by 9 publications

(12 citation statements)

References 57 publications

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“…The analyzed spectra were averaged over three registered spectra series. Spectral analyses were carried out by employing GRAMS AI Spectral Notebase (Thermo Fisher Scientific) [Pytlak et al, 2020].…”

Section: Ftir Analysis and Data Manipulationmentioning

confidence: 99%

Effect of Composition and Processing Conditions on Selected Properties of Potato-Based Pellets and Microwave-Expanded Snacks Supplemented with Fresh Beetroot Pulp

Lisiecka¹,

Wójtowicz²,

Sujak³

2021

Pol. J. Food Nutr. Sci.

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The aim of this study was to evaluate the influence of the addition of fresh beetroot pulp in amounts from 2.5 to 30.0 g/100 g, as well as variable screw speeds (60, 80, 100 rpm) on the chemical composition, water absorption, water solubility index, density, expansion rate, and texture of potatobased pellets and expanded snacks. Their protein and starch structure was analyzed using the Fourier-transformed infrared (FTIR) spectroscopy. The snack pellets were made at a moisture content of 33 g/100 g of blends using a single-screw extruder equipped with a plasticizing unit having a length-to-diameter ratio (L/D) of 18. Processing temperature ranged from 65 to 105°C. The ready-to-eat snacks were expanded using microwave treatment (750 W, 40 s). Fresh vegetable pulp addition raised the protein content. The extrusion-cooking caused an increase in the content of insoluble dietary fiber and water absorption index of the pellets. In contrast, the microwave treatment reduced values of these parameters in expanded products and decreased the insoluble dietary fiber content of the expanded snacks. The addition of fresh beetroot pulp diminished the expansion ability and increased the content of β-sheet proteins. Additionally, an increase in the content of β-turn and β-sheet protein fractions was observed at the expense of random coil structure. This indicates that the protein structure underwent some form of ordering as the molecular interactions of the proteins intensified. The highest fraction of β-structures and the smallest content of random coil were observed when 80 rpm was applied during processing. It seems to be the most efficient screw speed in processing fresh beetroot pulp-supplemented snack pellets. Application of a fresh beetroot pulp as an additive in microwave expanded snacks made it possible to obtain products with an increased amount of fiber and a reduced fat content as an attractive and healthy alternative to deep-fried snacks.

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Section: Ftir Analysis and Data Manipulationmentioning

confidence: 99%

Effect of Composition and Processing Conditions on Selected Properties of Potato-Based Pellets and Microwave-Expanded Snacks Supplemented with Fresh Beetroot Pulp

Lisiecka¹,

Wójtowicz²,

Sujak³

2021

Pol. J. Food Nutr. Sci.

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“…Apparently, the coal microbial activity was weak in the samples without any treatment (Table ), and microbial invasion could affect coal bacterial activity. Similarly, Pytlak et al found that microbial groups from different sources would produce different intensities of coal seam degradation. Other studies also found that exogenous microorganisms, both acclimated and environmental, influenced microbial activity.…”

Section: Discussionmentioning

confidence: 98%

“…Compared to samples from coal mines that have the potential to produce methane, this value was at a very low level. For example, the relative abundance of methanogen Methanosarcina alone exceeded 60% of the archaeal counts in the Pniowek coal mine samples 29 and a Montana coal sample. 41 This result may be an important factor for the low methanogenic potential of the coal samples in this study.…”

Section: Discussionmentioning

confidence: 99%

Subsurface Microbial Invasion Affects the Microbial Community of Coal Seams

Liu

Yuan

et al. 2021

Energy Fuels

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Coal seam microorganisms have attracted much attention for their special functions that are closely related to secondary biogenic gas formation, but the influence of subsurface microbial invasion on coal microorganisms remains poorly understood. In this study, subsurface microorganisms from soils at different depths were used to infect coal samples, and the abundance and composition of the microbial community were analyzed by quantitative polymerase chain reaction (PCR) and high-throughput sequencing. The results showed that methane production from the coal samples treated with soil extractions did not increase significantly nor did the abundance and transcriptional activity of archaeal 16S rRNA and mcrA genes. In contrast, two soil extractions significantly improved the abundance and transcriptional activity of the coal bacteria. There was no significant difference in the effects of different soil extractions on bacterial abundance and transcriptional activity, but differences in the effects on α- and β-bacterial diversity between the coal samples treated by different soil extractions were found. Soil extraction from the shallow layer soil far away from the coal mine increased the bacterial α-diversity of the coal samples and changed the bacterial community composition. In addition, this soil extraction increased various bacterial groups in the coal sample and changed the predictive metagenome functional contents of the coal samples from the bacterial sequence data. In summary, this study provides basic microbial information for subsurface microbial invasion of coal seams and helps increase understanding of the source of microorganisms in in situ coal seams and the changes in the microbial community during subsurface microbial migration.

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“…The base properties of coals have been reported elsewhere (Su et al 2018;Liu et al 2019;Wang et al 2019a), including total carbon (TC, 72.82-87.65% in the ck group and 37.67-91.67% in the nutrient group), total nitrogen (TN, 0.93-1.79% in the ck group and 0.36-1.80% in the nutrient group), total oxygen (TO, in the ck group and 3.47-17.39% in the nutrient group), total hydrogen (TH, 4.09-6.16% in the ck group and 2.58-5.58% in the nutrient group), dry ash-free volatiles (Vdaf, 5.34-32.05% in the ck group and 9.16-31.15% in the nutrient group), air dry ash (Ad, in the ck group and 3.73-20.50% in the nutrient group), air dry moisture (Mad, 1.44-7.50% in the ck group and 0.44-32.27% in the nutrient group) and fixed carbon (FC, in the ck group and 31.03-80.99% in the nutrient group). The nutrients in different reported studies were different, such as carbon sources (acetate, yeast powder, or peptone), 361 contents of ammonium, sodium, and phosphate (Davis et al 2018;Detman et al 2018;in 't Zandt et al 2018;Su et al 2018;Wang et al 2019b;Bucha et al 2020;Pytlak et al 2020). Thus, nutrient concentration ranges used for the present study were: organic carbon (OC), 0-12 g/l; ammonium (NH 4 + ), 0-0.34 g/l; sodium (Na + ), 0-4.33 g/l; chloride (Cl -), 0-7.05 g/l; potassium (K + ), 0-0.67 g/l; phosphate as HPO 4 2-/H 2 PO 4-, 0-6.46 g/l; sul-phate (SO 4 2-), 0-2.75 g/l; magnesium (Mg 2+ ), 0-0.70 g/l; and calcium (Ca 2+ ), 0-0.05 g/l.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

“…Researchers have mainly focused on the abundance and activity of methanogenic archaea in addition to microbial diversity under nutrient stimulation (in 't Zandt et al 2018;Wang et al 2019b;Bucha et al 2020;Pytlak et al 2020). These methanogenic groups are the drivers of the final step in degrading organic matter into methane in coal seams (Vick et al 2019).…”

Section: Nutrients Changed the Assembly Processes Of Profuse And Rare...mentioning

confidence: 99%

Nutrients Changed the Assembly Processes of Profuse and Rare Microbial Communities in Coals

Zhang

Xue

Chang

et al. 2022

Polish Journal of Microbiology

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Nutrient stimulation is considered effective for improving biogenic coalbed methane production potential. However, our knowledge of the microbial assembly process for profuse and rare microbial communities in coals under nutrient stimulation is still limited. This study collected 16S rRNA gene data from 59 microbial communities in coals for a meta-analysis. Among these communities, 116 genera were identified as profuse taxa, and the remaining 1,637 genera were identified as rare taxa. Nutrient stimulation increased the Chao1 richness of profuse and rare genera and changed the compositions of profuse and rare genera based on nonmetric multidimensional scaling with Bray-Curtis dissimilarities. In addition, many profuse and rare genera belonging to Proteobacteria and Acidobacteria were reduced, whereas those belonging to Euryarchaeota and Firmicutes were increased under nutrient stimulation. Concomitantly, the microbial co-occurrence relationship network was also altered by nutrient addition, and many rare genera mainly belonging to Firmicutes, Bacteroides, and Euryarchaeota also comprised the key microorganisms. In addition, the compositions of most of the profuse and rare genera in communities were driven by stochastic processes, and nutrient stimulation increased the relative contribution of dispersal limitation for both profuse and rare microbial community assemblages and that of variable selection for rare microbial community assemblages. In summary, this study strengthened our knowledge regarding the mechanistic responses of coal microbial diversity and community composition to nutrient stimulation, which are of great importance for understanding the microbial ecology of coals and the sustainability of methane production stimulated by nutrients.

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Stimulation of methanogenesis in bituminous coal from the upper Silesian coal basin

Cited by 9 publications

References 57 publications

Effect of Composition and Processing Conditions on Selected Properties of Potato-Based Pellets and Microwave-Expanded Snacks Supplemented with Fresh Beetroot Pulp

Effect of Composition and Processing Conditions on Selected Properties of Potato-Based Pellets and Microwave-Expanded Snacks Supplemented with Fresh Beetroot Pulp

Subsurface Microbial Invasion Affects the Microbial Community of Coal Seams

Nutrients Changed the Assembly Processes of Profuse and Rare Microbial Communities in Coals

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